Cyrus performed Mendes' hit "In My Blood" along with the pop star. The song began with Mendes performing solo at his piano, but after the first verse and chorus, he welcomed Cyrus to the main stage and joined her there.

Mendes was a first time nominee at this year's show, nominated for "In My Blood" for Song of the Year as well as Best Pop Vocal Album for his self-titled album.

Cyrus hit the red carpet earlier with her father, Billy Ray Cyrus, and mother, Tish Cyrus. Cyrus had customized heels with stilettos that had her initials "M" and "C" engraved into them. Her husband, Liam Hemsworth, was unable to attend the 2019 Grammy Awards because he is currently in the hospital.

Watch: The Amazing Coincidence of Carrie Underwood's "Before He Cheats"